Barnes & Noble (NYSE:BKS) should spin off its Nook Media unit of e-readers and e-books fulfilling a strategy the company said it was exploring at the start of 2012 according to a letter sent by an investor to company management on Friday. Rick Schottenfeld head of investment firm the Schottenfeld Group said in a letter sent to Barnes & Noble that the company should follow through on a proposal to spin off its fast growing Nook business into a separate publicly traded company. The move Schottenfeld said would help to the bookseller's strategy and unlock significant shareholder value. A ...